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SER VICING
combination boiler -
Installation and Servicing
1.
Refer to Frame 49.
2.
Remove the casing. Refer to Frame 41.
3.
Unplug the electrical leads from the sensors.
4.
Withdraw the sensor.
5.
Fit the new sensor, using the clip supplied.
6.
Re-assemble in reverse order.
5 0 C.H. AND D.H.W. SENSOR REPLACEMENT
4
5
Relation between the temperature (°C) and nominal resistance
(Ohm) of the CH and DHW sensors.
Example:
At 25°C, the nominal resistance is 9888 Ohm
At 85°C, the nominal resistance is 1075 Ohm
T°C
0
5
0
33242
25633
10
19947
15659
20
12394
9888
30
7947
6433
40
5242
4300
50
3548
2945
60
2459
2063
70
1740
1475
80
1256
1075
90
923
797
100
690
600
TABLE OF RESISTANCE VALUES AS A FUNCTION
OF THE TEMPERATURE OF THE SENSORS
5 1 FAN REPLACEMENT
1.
Refer to Frame 49.
2.
Remove the boiler casing. Refer to Frame 41.
3.
Disconnect the electrical leads from the fan.
4.
Undo the retaining screw(s) on the fan mounting bracket.
5.
Slide the fan forward and down and disengage from the
outlet connector.
6.
Separate the fan from its mounting plate.
5
7.
Re-fit the new fan in reverse order taking care not to
overtighten the single retaining screws on the fan mounting
plate, and engage the rear location lugs before engaging
the fan outlet connector.
SER
VICING
4